Photon number-resolved measurement of an exciton-polariton condensate

M. Klaas, E. Schlottmann, H. Flayac, F P. Laussy, F. Gericke, M. Schmidt, M. v. Helversen, J. Beyer, S. Brodbeck, H. Suchomel, Sven Höfling, S. Reitzenstein, C. Schneider

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14 Citations (Scopus)


We measure the full photon-number distribution emitted from a Bose condensate of microcavity exciton-polaritons confined in a micropillar cavity. The statistics are acquired by means of a photon number resolving transition edge sensor. We directly observe that the photon-number distribution evolves with the non-resonant optical excitation power from geometric to quasi-Poissonian statistics, which is canonical for a transition from a thermal to a coherent state. Moreover, the photon-number distribution allows evaluating the higher-order photon correlations, shedding further light on the coherence formation and phase transition of the polariton condensate. The experimental data is analyzed in terms of thermal coherent states which allows one to directly extract the thermal and coherent fraction from the measured distributions. These results pave the way for a full understanding of the contribution of interactions in light-matter condensates in the coherence buildup at threshold.
Original languageEnglish
Article number047401
Number of pages6
JournalPhysical Review Letters
Issue number4
Early online date25 Jul 2018
Publication statusPublished - 27 Jul 2018


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